laravel 从多维数组创建集合？
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Creating a collection from a multidimensional array?
提问by panthro
I'm trying to make a collection from some arrays of data:
我正在尝试从一些数据数组中收集：
$myCollection = collect(
['product_id' => 1, 'price' => 200, 'discount' => '50'],
['product_id' => 2, 'price' => 400, 'discount' => '50']
);
When I loop out I would like to do:
当我退出时，我想做：
foreach ($myCollection as $product) {
echo $product->price;
echo $product->discount;
}
But the underlying elements appear to still be in an arrays format, how can I achieve the above output?
但是底层元素似乎仍然是数组格式，我该如何实现上述输出？
回答by Gravy
If you want the inner arrays to be a collection, then you can do so as follows:
如果你想让内部数组成为一个集合，那么你可以这样做：
$myCollection = collect([
['product_id' => 1, 'price' => 200, 'discount' => '50'],
['product_id' => 2, 'price' => 400, 'discount' => '50']
])->map(function($row) {
return collect($row);
});
If you want the inner arrays to be objects, then you can do as follows:
如果您希望内部数组是对象，那么您可以执行以下操作：
$myCollection = collect([
['product_id' => 1, 'price' => 200, 'discount' => '50'],
['product_id' => 2, 'price' => 400, 'discount' => '50']
])->map(function($row) {
return (object) $row;
});
You can also iterate over each of the results...
您还可以迭代每个结果...
$myCollection = collect([
['product_id' => 1, 'price' => 200, 'discount' => '50'],
['product_id' => 2, 'price' => 400, 'discount' => '50']
])->map(function($row) {
return (object) $row;
})->each(function($row) {
echo sprintf('ProductId: %d, Price: %d, Discount: %s'.PHP_EOL, $row->product_id, $row->price, $row->discount);
});
Output:
输出：
ProductId: 1, Price: 200, Discount: 50
ProductId: 2, Price: 400, Discount: 50
回答by Troyer
Simple as you are getting a collection of an associative arrays because you are collecting arrays elements, so the collection helper doesn't want to modify it in case you need it as array.
很简单，因为您正在收集关联数组的集合，因为您正在收集数组元素，因此集合助手不想修改它，以防您需要它作为数组。
Knowing this, if you want to collect objects you should pass an element of object type.
知道这一点，如果你想收集对象，你应该传递一个对象类型的元素。
You can cast object data type into the array, like this:
您可以将对象数据类型转换为数组，如下所示：
$myCollection = collect( (object) array(
(object) ['product_id' => 1, 'price' => 200, 'discount' => '50'],
(object) ['product_id' => 2, 'price' => 400, 'discount' => '50'])
);
Then you have a collection of objects !
然后你有一个对象的集合！
回答by Margus Pala
Function collect() takes array of elements. You can fix your code also by enclosing all the elements into [] and then converting Collection elements to objects instead of leaving them to be arrays
函数 collect() 接受元素数组。您也可以通过将所有元素包含在 [] 中，然后将 Collection 元素转换为对象而不是将它们保留为数组来修复代码
$myCollection = collect([
(object)(['product_id' => 1, 'price' => 200, 'discount' => '50']),
(object)(['product_id' => 2, 'price' => 400, 'discount' => '50'])
]
);
foreach ($myCollection as $product) {
echo $product->price;
echo $product->discount;
}
回答by edcs
There's a syntax error in your collection definition:
您的集合定义中存在语法错误：
$myCollection = collect([
['product_id' => 1, 'price' => 200, 'discount' => '50'],
['product_id' => 2, 'price' => 400, 'discount' => '50']
]);
Also, since you're using a Collection, you no longer need to use a foreachloop:
此外，由于您使用的是 a Collection，您不再需要使用foreach循环：
$myCollection->each(function ($item) {
echo $item['price'];
})
